Cecily Cambell just wants to be a Knight and protect her home like her father and grandfather before her. There's just one problem: she’s incompetent! During a fight with a crazed swordsman, Cecily’s cherished blade breaks; and just as she’s about to be cut down, a man named Luke comes to her rescue wielding a katana - a blade unlike any Cecily has seen before. Together they must ensure that the Demon Sword Aria doesn’t fall into the wrong hands, and Cecily alone must prove herself worthy of her very own katana.